A velocity - time graph
shows
how an objectsvelocity (how fast it
is moving) changes with time.

Velocity
- Time
Graphs forConstant Velocity and ConstantAcceleration.

The picture below
shows a velocity - time graph
for an object with a
velocity that does not change.

The straight horizontal
line in the graph above shows
that the objects velocity does
not change as time goes by.
The object is said to have a constant
velocity.
Compare this with the distance-time graph for constant velocity.

The picture below
shows a velocity - time graph
for an object with a velocity
that increases at a constantrate.

The straight line sloping
upwards in the graph above
shows
that the objects velocity is
increasing as time goes by.Increasingvelocity is
called acceleration.

What is ConstantAcceleration?

The straight line in
the graph above shows that
the velocity of the object
has a constantacceleration.
This means that thevelocity of the object
is changing at a constantrate.

The slope of the line in the graph above shows
1. the acceleration is positive because the
lineslopes
upwards
2. how fast the acceleration is.
The greater the slope,
the faster the acceleration is.